<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>
      <!-- 角色列表区 -->
      <el-table :data="rolesList" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          
          <template slot-scope="scope">
            <el-row v-for="(item1, index1) in scope.row.children" :key="item1.id" :class="['dbbottom', index1 === 0 ? 'dbtop' : '', 'vcenter']" >
              <!-- 渲染第一级权限 -->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row, item1.id)">{{item1.authName}}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级权限 -->
              <el-col :span="19">
                <el-row v-for="(item2, index2) in item1.children" :key="item2.key" :class="[index2 === 0 ? '' : 'dbtop', 'vcenter']">
                  <el-col :span="6">
                    <el-tag type="success" closable @close="removeRightById(scope.row, item2.id)">{{item2.authName}}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <!-- 渲染三级权限 -->
                  <el-col :span="18">
                    <el-tag v-for="item3 in item2.children" :key="item3.key" type="warning" closable
                    @close="removeRightById(scope.row, item3.id)">{{item3.authName}}</el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <!-- 操作区 -->
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
            <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
            <el-button type="warning" icon="el-icon-setting" size="mini" @click="showSetRightDialog(scope.row)">分配</el-button>
          </template>
        </el-table-column>

      </el-table>
    </el-card>
    <!-- 分配权限对话框 -->
    <el-dialog
      title="提示"
      :visible.sync="setRightDialogVisible"
      width="50%" @closed="setRightDialogClosed">
      <!-- 树形控件 -->
      <el-tree :data="rightsList" :props="treeProps" show-checkbox node-key="id" default-expand-all :default-checked-keys="defKeys" ref="treeRef"></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary"  @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      rolesList: [],
      // 角色分配对话框显示变量
      setRightDialogVisible: false,  
      // 权限列表
      rightsList: [],
      // 树形控件的绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认选中的节点id值数组
      defKeys: [105, 116],
      // 当前授权的id
      roleId: ''
    }
  },
  created () {
    this.getRolesList()
  },
  methods: {
    // 获取角色列表
    async getRolesList() {
      const {data: res} = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败')
      }
      this.rolesList = res.data
    },

    // 根据id删除对应的权限
    async removeRightById(role, rightId) {
      const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)

      if(confirmResult !== 'confirm') {
        return this.$message.info('取消了删除')
      }

      const {data: res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败')
      }
      role.children = res.data
      this.$message.success('删除权限成功')
    },

    // 点击按钮展示分配权限对话框
    async showSetRightDialog(role) {
      // 获取当前角色的id
      this.roleId = role.id
      // 获取所有权限的数据
      const {data: res} = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取所有权限列表失败')
      }
      this.rightsList = res.data
      // 递归获取三级节点的id
      this.getLeafKeys(role, this.defKeys)
      // 显示角色分配对话框
      this.setRightDialogVisible = true
    },

    // 通过递归的形式，获取角色下所有三级权限的id，并保存到defkeys数组中
    getLeafKeys(node, arr) {
      //如果当前node节点中不包含children属性，则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }

      node.children.forEach(item => this.getLeafKeys(item, arr))
    },

    // 监听分配权限对话框的关闭事件
    setRightDialogClosed() {
      this.defKeys = []
    },

    // 点击为角色分配权限
    async allotRights() {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]

      const idStr = keys.join(',')
      
      const {data: res}= await this.$http.post(`roles/${this.roleId}/rights`, {rids: idStr})
      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败')
      }
      this.getRolesList()
      this.setRightDialogVisible = false
      this.$message.success('分配权限成功')
    }
  }
}
</script>

<style lang="less" scoped>
.el-tag {
  margin: 7px;
}

.dbtop {
  border-top: 1px solid #eee;
}

.dbbottom {
  border-bottom: 1px solid #eee;
}

.vcenter {
  display: flex;
  align-items: center;
}
</style>